Questions 16 to 18 are based on the passage you have just heard.[音频]
A. Many escaped from farms and became wild.
B. They were actually native to North America.
C. Many got killed in the wild when searching for food.
D. They were hunted by Spanish and Russian explorers.
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Questions 16 to 18 are based on the passage you have just heard.
A. They often make sudden attacks on people.
B. They break up nature's food supply chain.
C. They cause much environmental pollution.
D. They carry a great many diseases.
Questions 16 to 18 are based on the passage you have just heard.
A. They lived peacefully with wild pigs.
B. They ran out of food completely.
C. They fell victim to eagles.
D. They reproduced quickly.
Questions 19 to 21 will be based on the passage you have just heard.[音频]
A. Taste coffee while in outer space.
B. Roast coffee beans in outer space.
C. Develop a new strain of coffee bean.
D. Use a pressurized tank to brew coffee.
Questions 19 to 21 will be based on the passage you have just heard.
A. They can easily get burned.
B. They float around in the oven.
C. They have to be heated to 360°C.
D. They receive evenly distributed heat.
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